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The Agency for Toxic Substances and Disease Registry (ATSDR) has identified seven exposure
situations for the Kennecott Utah Copper South National Priorities List (NPL) Site (Table 2).
One exposure situation, Butterfield Creek, is considered a past and current public health hazard
until the on-going removal and remediation is complete. Residents on 30 properties identified for
soil removal may have been exposed to high levels of lead from contaminated soils.

Though mitigated, one exposure situation (Southwest Jordan Groundwater), is considered a past
public health hazard because a few people used a private drinking water well with concentrations
above the 1500 ppm EPA Region VIII recommended risk level. In addition to providing
alternative water supplies, Kennecott's comprehensive well inventory, groundwater monitoring,
and private well testing programs have greatly reduced the potential for human exposure to
concentrations of sulfate above 1500 parts per million.

Present and future conditions of soils in the Bingham Creek area are considered as no apparent
public health concern because of the successful removal of highly contaminated soils by
Kennecott, the Environmental Protection Agency (EPA), and the Atlantic Richfield Company
(ARCO). Before removal actions, the floodplain and lower channel areas of Bingham Creek
contained contaminated soils that may have posed a public health hazard. The surface soils in the Copperton area are classified as no apparent health hazard because the contaminant
concentrations, frequency and duration of exposure, and opportunity for human exposure are not
sufficient to generate adverse health effects in the residential population. There was not sufficient
information to determine a public health hazard for one of the exposure situations (Pine Canyon
Groundwater); it is categorized as indeterminate public health hazards.

In response to a Bingham Creek resident's concern about his family's exposure to the lead
contaminated soils in his yard, ATSDR evaluated the soil-lead levels and the family's blood lead
measurements. The soil lead levels identified may have been high enough to result in health
effects if there were frequent exposure to the contaminated soil. However, the results of the
blood lead testing indicate that significant exposures were not occurring at that time because
blood lead concentrations were below the concern level of 10 micrograms per deciliter (µg/dL).
It is not possible to determine whether significant exposures (i.e., above 10 µg/dL) could have occurred at another time.

ATSDR recommends the following:

1. For the public health hazard associated with the sulfate contaminants in Southwest Salt Lake
County, Kennecott's on-going mitigative measure of private well testing and provision of
alternative water should be continued.

The Salt Lake County Health Department and the Utah Department of Health have conducted all
public health actions appropriate based on past and current conditions and information. If new
information indicates a change of site conditions, the Agency for Toxic Substances and Disease
Registry (ATSDR) will re-evaluate the site for any appropriate additional public health actions.